We have had a recurring issue with what we’ve been told by a few pool experts to be Mustard algae. We’ve been through at least 8 cycles over the last two summers of adding Mustard-eze, power shocking and brushing every 4 hours for 5 days and while it will nearly dissipate — it comes back in all its glory. Does anyone know of an alternative treatment option or a company that is specializes in treating pool algae. Notable here too is that nobody has officially tested to determine type of algae — but it does resemble mustard algae from pics, videos and the way it dissipates when brushed. Any help would be appreciated.